cd-boot-images-riscv64 5 (riscv64 binary) in ubuntu jammy

 Provide a RISC-V images for debian-cd and ubuntu-image.
 .
 Trees of bootloader components are provided together with a sample
 xorriso command to use.
 .
 In addition to the provided files, grub.cfg has to be provided by
 the consumer of these products.
 .
 This package must be rebuilt whenever grub-efi-riscv64-bin is updated.